See the solutions to these problems just after the percentage calculator below.

Here are the solutions to the questions stated above:

Always use this formula to find a percentage:

^{%} / _{100} = ^{Part} / _{Whole} replace the given values:

^{6.4} / _{100} = ^{Part} / _{800}

Cross multiply:

6.4 x 800 = 100 x Part, or

5120 = 100 x Part

Now, divide by 100 and get the answer:

Part = ^{5120} / _{100} = 51.2

Use again the same percentage formula:

^{%} / _{100} = ^{Part} / _{Whole} replace the given values:

^{%} / _{100} = ^{6.4} / _{800}

Cross multiply:

% x 800 = 6.4 x 100

Divide by 800 and get the percentage:

% = ^{6.4 x 100} / _{800} = 0.8%